I'm having the same problem with both Ubuntu 18.04 and 20.04. Commenting
the line

modifier_map Mod3 { Scroll_Lock };

does help but it does not solve it. My system does not freeze anymore
but CPU usage still goes unusually up.

In addition, setting the brightness with the mouse by clicking and
dragging on the top bar makes the brightness icon lag and causes the
same odd CPU behavior.

It also only happens on xorg.

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https://bugs.launchpad.net/bugs/1895486

Title:
  [media-keys] Fn media keys with lag slow/delay on Gnome with "Scroll
  Lock" keyboards

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